Revision of Flabelligera Sars, 1829 (Polychaeta: Flabelligeridae) 3203 Author Salazar-Vallejo, Sergio I. text Zootaxa 2012 2012-02-22 3203 1 1 64 https://biotaxa.org/Zootaxa/article/view/zootaxa.3203.1.1 journal article 10.11646/zootaxa.3203.1.1 1175­5334 5248129 Flabelligera bophortica Annenkova-Chlopina, 1924 Figure 3 Flabelligera bophortica Annenkova-Chlopina 1924:127 ; Jirkov & Filippova 2001:361 , Figs. 1–4 . Type material. Northwestern Pacific Ocean. Eight syntypes ( ZIRAS-27043 ), seven with anterior end, Chukchi Sea, R / V Vaigach , Stat. 164 ( 69°24' N , 179°34' E ), 48 m , mud, 13 Jul. 1912 , Z.E. Arngold , coll. Seven syntypes ( ZIRAS-27044 ), very damaged anterior ends, off Cape Jakan , Long Strait , Chukchi Sea, R / V Vaigach , Stat. 142 ( 69°54' N , 176°08' E ), 13 m , pebbles, mud and sand, 31 Aug. 1911 , Z.E. Arngold , coll . Description . Best syntype (ZIRAS-27043) with tunic mostly removed, posterior chaetigers without chaetae, medially swollen ( Fig. 3A ). Body cylindrical, yellowish, tapering posteriorly; 39.5 mm long, 3 mm wide, cephalic cage 3 mm long, 44 chaetigers. Tunic transparent, very thin (from original description), severely eroded; body wall areolated, areoles squarish, about as long as wide (other syntypes with a thin layer of fine sediment); papillae long, distally swollen, some mucronate. Cephalic hood not exposed ( Fig. 3B ). Prostomium low cone, with four large black eyes. Caruncle well developed, extended slightly beyond the branchial plate margin; medial lobe elevated, dorsally pigmented ( Fig. 3C ); lateral lobes flat, pale. Palps slightly longer than branchiae, contracted; palp bases elevated, rounded. Lateral lips well developed, widened; dorsal lip projected anteriorly; ventral lip reduced. Branchiae separated into two lateral groups, each with a fold (due to contraction, not seen in other syntypes ); branchial filaments in 7–8 rows; each group with about 100 filaments, decreasing in size ventrally; longer filaments about 3/4 as long as palps. Nephridial lobes in branchial plate, base wide, conical, nephridial tube tapered, thin. Cephalic cage chaetae as long as 1/13 body length or as long as body width. Chaetiger 1 involved in cephalic cage; chaetae mostly broken, about 45 noto- and 20 neurochaetae. Anterior dorsal margin of chaetiger 1 papillated. Anterior chaetigers without especially long papillae. Chaetigers 1–3 decreasing in length posteriorly. Chaetal transition from cephalic cage to body chaetae abrupt; multiarticulated neurohooks from chaetiger 2. Gonopodial lobes in chaetigers 5 and 6; projecting, yellowish, rounded ( Fig. 3D ). Parapodia well developed, lateral; median neuropodia ventrolateral. Notopodia foliose with long papillae ( Fig. 3E ). Neuropodia conical with long papillae. Noto- and neuropodia widely separated. FIGURE 3 . Flabelligera bophortica Annenkova-Chlopina, 1924 , syntypes (ZIRAS-27043). A. Best syntype, lateral view. B. Same, anterior end, oblique, ventrolateral view. C. Same, head, frontal view (BS: branchial scars, Ca: caruncle, DL: dorsal lip, LL: lateral lip, PS: palp scar, VL: ventral lip). D. Same, neuropodia 4–7, oblique, ventral view showing gonopodial lobes (GL), E. Same, chaetiger 10, notochaetae (inserts: basal, medial and subdistal regions). F. Same, posterior chaetiger, neurohooks (inserts: handle articulation and crest close-up). Scale bars: A: 3.3 mm, B: 1.3 mm, C: 0.5 mm, D: 0.8 mm, E: 320 µm, F: 260 µm. Median notochaetae arranged in short rows, either longitudinal or transverse to body axis, depending on body contraction; all notochaetae multiarticulated capillaries, at least as long as body width, 12–14 per fascicle, most with medium-sized articles medially, hardly noticeable basally, becoming longer distally; 1–2 smaller notochaetae with long articles. Neurochaetae multiarticulated capillaries in chaetiger 1; single (rarely 2) multiarticulated hooks from chaetiger 2 ( Fig. 3F ). Handle articulation basally placed, articles irregular (Fibonacci); three articles: medium-sized, long, longer. Other articles anchylosed, small, continued to the bending region. Crest slightly wider than handle, yellowish, distally darker; width:length ratio 1:6(–7). Posterior end tapering to truncate cone; pygidium with anus terminal, pale muscular ring, without anal cirri. Oocytes in some mature females 100–150 µm. Variation . The syntype series includes some larger anterior fragments, reaching up to 8 mm wide, so the species may be larger than the described syntype . The body shape in all specimens is cylindrical, anteriorly truncate. The tunic is transparent but the external fine sediment layer renders it opaque. Remarks . Flabelligera bophortica Annenkova-Chlopina, 1924 might be closely allied to the poorly known F. buski ( McIntosh, 1869 ) , because both have neurohooks with long crests. These two species differ because F. bophortica has mostly single neurohooks per neuropodium and the crests have a width:length ratio of 1:6(7), whereas in F. buski there are usually two neurohooks per neuropodium and the crests have a width:length ratio of 1:9. Jirkov & Filippova (2001:361 , Figs. 1–4 ) used F. bofortica instead of the original name; such replacement is inadequate. Further, they shortened the author’s last name; although most of her papers were published using only Annenkova , in some publications, including the one where this species was described, she used Annenkova- Chlopina so this must be the author’s name for this species. On the other hand, probably due to space limitations, Jirkov & Filippova inverted their Figure 1 , showing neuropodia as the upper section. Distribution. Russian Arctic Ocean, in 13–48 m , in fine or mixed sediments.